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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Bell, Michael P. Pease, Larry R. Marler, Ronald J. Nava-Parada, Pilar Felts, Sara J. Cabrera, Rosalyn Schenk, Erin L. Van Keulen, Virginia P. Radhakrishnan, Suresh |
| Description | Country affiliation: United States Author Affiliation: Radhakrishnan S ( Department of Immunology, College of Medicine, Mayo Clinic, Rochester, MN 55905, USA.) |
| Abstract | Lymphocyte differentiation from naive CD4(+) T cells into mature Th1, Th2, Th17, or T regulatory cell (Treg) phenotypes has been considered end stage in character. In this study, we demonstrate that dendritic cells (DCs) activated with a novel immune modulator B7-DC XAb (DC(XAb)) can reprogram Tregs into T effector cells. Down-regulation of FoxP3 expression after either in vitro or in vivo Treg-DC(XAb) interaction is Ag-specific, IL-6-dependent, and results in the functional reprogramming of the mature T cell phenotype. The reprogrammed Tregs cease to express IL-10 and TGFbeta, fail to suppress T cell responses, and gain the ability to produce IFN-gamma, IL-17, and TNF-alpha. The ability of IL-6(+) DC(XAb) and the inability of IL-6(-/-) DC(XAb) vaccines to protect animals from lethal melanoma suggest that exogenously modulated DC can reprogram host Tregs. In support of this hypothesis and as a test for Ag specificity, transfer of DC(XAb) into RIP-OVA mice causes a break in immune tolerance, inducing diabetes. Conversely, adoptive transfer of reprogrammed Tregs but not similarly treated CD25(-) T cells into naive RIP-OVA mice is also sufficient to cause autoimmune diabetes. Yet, treatment of normal mice with B7-DC XAb fails to elicit generalized autoimmunity. The finding that mature Tregs can be reprogrammed into competent effector cells provides new insights into the plasticity of T cell lineage, underscores the importance of DC-T cell interaction in balancing immunity with tolerance, points to Tregs as a reservoir of autoimmune effectors, and defines a new approach for breaking tolerance to self Ags as a strategy for cancer immunotherapy. |
| ISSN | 00221767 |
| e-ISSN | 15506606 |
| Journal | The Journal of Immunology |
| Issue Number | 5 |
| Volume Number | 181 |
| Language | English |
| Publisher | The American Association of Immunologists |
| Publisher Date | 2008-09-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Antibodies Pharmacology Antigens, Cd80 Immunology Autoimmunity Drug Effects Forkhead Transcription Factors Interleukin-17 Biosynthesis T-lymphocytes, Regulatory Cytology Animals Cell Communication Cytokines Dendritic Cells Immune Tolerance Mice Multiple Myeloma Therapy Programmed Cell Death 1 Ligand 2 Protein T-cell Antigen Receptor Specificity Vaccines Research Support, N.i.h., Extramural Retracted Publication Discipline Immunology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Immunology and Allergy Immunology |
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